Led light

ABSTRACT

The present disclosure provides an LED straight light including a light tube with two pins at both ends, an LED installed in the light tube and a driving circuit. The driving circuit includes a mains branch and a signal branch. The mains branch is coupled to the pins at one end of the light tube for transmitting power to the LED for power supply. The signal branch is coupled to the pins at the other end of the light tube for transmitting external driving signals to control the on/off of the mains branch. The LED straight light of the present disclosure is powered by two ends, one of the two ends supplies power to the LED through the mains branch, and the other end receives driving signals to control the on/off of the mains branch.

TECHNICAL HELD

The present disclosure relates to an LED light, and in particular, to anLED light with high safety performance.

BACKGROUND

Traditional fluorescent tubes are powered at both ends thereof. In orderto minimize circuit changes, some alternative LED lights are alsopowered at both ends thereof. During installation, in the case where oneend of the LED light has already been powered on, if a person touchesthe other end, there is a risk of electric shock. To solve this problem,some existing lights are provided with a current detection unit in adriving circuit. When powered on, the light is instantaneously turned onso as to detect the current flowing through the load. Whether the lightis installed in place can be determined according to the detectedcurrent value. However, this method has a risk of misjudgment and thecorresponding circuit has a relatively complicated structure.

SUMMARY

The present disclosure provides an LED light that can avoid electricshock during installation.

An LED light includes an LED and a driving circuit. The LED light hastwo power connecting terminals that is a first terminal and a secondterminal, respectively, wherein the driving circuit comprises a mainsbranch and a signal branch, and wherein the signal branch is coupled tothe first terminal for transmitting external driving signals to controlon/off of the mains branch, and the main branch is coupled to the secondterminal for transmitting power to the LED for power supply.

in the present disclosure, the LED light is powered by two ends, one ofthe two ends supplies power to the LED through the mains branch, and theother end receives driving signals to control the on/off of the mainsbranch. Only one end is installed on the light holder, and the mainsbranch cannot be powered so as to avoid electric shock.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a is a schematic diagram of an LED emergency light in the priorart;

FIG. 1b is a schematic diagram of an embodiment of an emergency branchaccording to the present disclosure;

FIG. 2a is a schematic diagram of an embodiment of an LED emergencylight according to the present disclosure;

FIG. 2b is a schematic diagram of an embodiment of an LED lightaccording to the present disclosure;

FIG. 3 is a schematic diagram of an embodiment of a lighting systemaccording to the present disclosure;

FIG. 4 is a schematic diagram of an embodiment of a lighting systemaccording to the present disclosure;

FIG. 5 is a schematic diagram of an embodiment of an LED emergency lightaccording to the present disclosure;

FIG. 6a is a schematic diagram of an embodiment of an LED emergencylight according to the present disclosure;

FIG. 6b is a schematic diagram of an embodiment of an LED emergencylight according to the present disclosure;

FIG. 7 is a schematic diagram of an embodiment of an LED emergency lightaccording to the present disclosure;

FIG. 8 is a schematic diagram of an embodiment of an LED emergency lightaccording to the present disclosure;

FIG. 9 is a schematic diagram of an embodiment of an LED emergency lightaccording to the present disclosure;

FIG. 10 is a schematic diagram of an embodiment of a lighting system ofthe present disclosure;

FIG. 11 is a circuit diagram of a second rectifier and filter module ofan LED emergency light according to the present disclosure;

FIG. 12 is a circuit diagram from a first switch to a constant currentmodule of an LED emergency light according to the present disclosure;

FIG. 13 is a circuit diagram from a control module to a constant currentmodule of an LED emergency light according to the present disclosure;

FIG. 14 is a circuit diagram of a constant voltage module of an LEDemergency light according to the present disclosure;

FIG. 15 is a circuit diagram of a constant current module of an LEDemergency light according to the present disclosure;

FIG. 16 is a circuit diagram of a power storage module of an LEDemergency light according to the present disclosure;

FIG. 17 is a circuit diagram of a boosting module of an LED emergencylight according to the present disclosure;

FIG. 18 is a circuit diagram of a control module of an LED emergencylight according to the present disclosure;

FIG. 19 is a three-dimensional structure view of an LED emergency lightaccording to the present disclosure;

FIG. 20 is a partial exploded view of an LED emergency light accordingto the disclosure;

FIG. 21 is a schematic view of the interior of an LED emergency lightaccording to the disclosure;

FIG. 22 is a partial exploded view of an LED emergency light accordingto the disclosure;

FIG. 23 is a flow chart of a control method of an LED emergency lightaccording to the present disclosure;

FIG. 24 is a circuit diagram of a constant current module of anembodiment of an LED emergency light according to the presentdisclosure.

LIST OF REFERENCE NUMERALS

1, tube body; 11, bottom case; 111, first receiving groove; 112, secondreceiving groove; 113, installation chamber; 114, heat dissipation rib;12, light transmitting cover, 121, tab; 13, installation section; 131,positioning groove; 132, tab; 2, end cap; 21, pin; 3, end cap; 31, pin;4, LED light bar; 5, circuit board; 51, fifth switch; 52, indicatorlight; 53, third switch.

DESCRIPTION OF THE EMBODIMENTS

The technical solutions according to the embodiments of the presentdisclosure will be described apparently and completely below withreference to the drawings according to the embodiments of the presentdisclosure. Obviously, the described embodiments are illustrated as apart of the embodiments of the present disclosure, but not exhaustive.Based on the embodiments of the present disclosure, all otherembodiments obtained by a person skilled in the art without inventiveefforts fall within the protection scope of the present disclosure.

It should be noted that, when a component is “connected” with anothercomponent, it may be directly connected to another component or may beindirectly connected to another component through a further component.Similarly, when a component is “provided” on another component, it maybe directly provided on another component or may be provided on anothercomponent through a further component.

Unless otherwise defined, all technical and scientific terms used hereinhave the same meaning as commonly understood by a person skilled in theart. The terms in the description of the present disclosure are used todescribe specific embodiments, and not to limit the present disclosure.The terms “and/or” used herein are intended to include one or more ofthe correspondingly listed options.

Referring to FIG. 1 a, a driving circuit of a conventional LED emergencylight includes a mains branch and an emergency branch with a powerstorage module. When power is on, an external power source suppliespower to the LED via the mains branch, and when power is off, the powerstorage module supplies power to the LED.

Referring to FIG. 1 b, most emergency branches further includes acharging circuit. When power is on, the external power source chargesthe power storage module via the charging circuit. The expressions “whenpower is on” or “when power is off” refer to the cases where the LEDemergency light is or is not connected to the external power source. Theexternal power source may be a DC power supply or an AC power supply.

Some existing LED emergency lights such as straight lights have twopower connecting terminals which are simultaneously coupled to the mainsbranch. In the case where one of the two power connecting terminals isconnected to the power supply, if an operator touches the other powerconnecting terminal, there may be a risk of electric shock.

Referring to FIG. 2a , in order to solve the above problem, anembodiment of the present disclosure provides an LED emergency light,which includes an LED and a driving circuit. The driving circuitincludes a signal branch, a mains branch, and an emergency branch with apower storage module. When power is on, the external power sourcesupplies power to the LED via the mains branch. When power is off, thepower storage module supplies power to the LED. The LED emergency lighthas two power connecting terminals, i.e., a first terminal and a secondterminal. The signal branch is coupled to the first terminal andfunctions to transmit external driving signals to control the on/off ofthe mains branch. The mains branch is coupled to the second terminal andfunctions to transmit power to the LED. The mains branch would not beturned on to supply power to the LED until both of the power connectingterminals are powered on, thereby avoiding the risk of electric shock.

In this embodiment, the power for operating the LED light is transmittedvia the second terminal, and the first terminal can be regarded as acontrol terminal, which transmits the external driving signals forcontrolling the mains branch to be turned on or off to supply power tothe LED. For example, a control element such as a switch may be providedin the mains branch, which functions to turn on or off and is controlledby the external driving signals from the first terminal.

Some LED lights with two power connecting terminals do not needemergency functions. Referring to FIG. 2b , in order to simplify thecircuit, a further embodiment of the present disclosure provides an LEDlight, which includes an LED and a driving circuit. The LED light hastwo power connecting terminals, i.e., a first terminal and a secondterminal. The driving circuit includes a mains branch and a signalbranch, wherein the signal branch is coupled to the first terminal andfunctions to transmit the external driving signals to control the on/offof the mains branch, and the mains branch is coupled to the secondterminal and functions to transmit power to the LED. The mains branchwould not be turned on to supply power to the LED until both of thepower connecting terminals are powered on.

Referring to FIG. 5, a mains branch in one embodiment includes a secondrectifier and filter module and a constant current module which arecoupled in sequence. After the second terminal is connected to an ACpower, the AC power is rectified and filtered by the second rectifierand filter module and converted into a DC power which is supplied to theLED via the constant current module. The technique of supplying power tothe LED via the constant current module is provided on the basis thatthe brightness of the LED is affected by the current. The constantcurrent module itself may be a known constant current module.Alternatively, some embodiments of the present disclosure below alsoprovide improved constant current modules.

Referring to FIG. 6a , a constant current module in one embodimentincludes a continuous current unit and a switching element which arecoupled between the second rectifier and filter module and the LED, anda first controller for controlling the turning on or off of theswitching element. A first control element is coupled between the secondrectifier and filter module and the power supplying terminal of thefirst controller. In the case where the first control element is turnedoff without receiving an external driving signal, the second rectifierand filter module is unable to supply power to the first controller, sothat the switching element is turned off. The constant current modulecannot functions normally, that is, it cannot supply power to the LED.Conversely, in the case where the first control element receives anexternal driving signal and is turned on, the constant current module isable to function normally and supply power to the LED.

The constant current module further includes a sampling unit. Thesampling unit collects current signals from the output terminal of theswitching element and feeds them back to the first controller, therebycontrolling the turning on or off of the switching element. Theswitching element is generally configured as a MOS transistor.

Referring to FIG. 6b , the signal branch in one embodiment includes afirst rectifier and filter unit and a first optocoupler which arecoupled in sequence. The first terminal is connected to an AC power,which can be converted into a DC power by means of the first rectifierand filter module to control the mains branch. The first optocouplerfunctions to isolate and increase the ground resistance at both ends ofthe light tube, thereby avoiding electric leakage.

In one embodiment, the first terminal is connected to a DC power andcoupled to the mains branch. In other words, the aforementioned firstrectifier and filter module is omitted.

Referring to FIG. 5, an emergency branch in one embodiment includes asecond rectifier and filter module, a constant voltage module, and apower storage module that are coupled in sequence. The second rectifierand filter module and the constant voltage module form a chargingcircuit, and the external power source supplies power to the powerstorage module via the second rectifier and filter module and theconstant voltage module in sequence. In the case where the externalpower source is an DC power, it can be directly supplied to the powerstorage module without requirement for a second rectifier and filtermodule. The power storage module generally includes a power storageelement such as a battery pack, and the charging and discharging of thepower storage module can be managed well with the constant voltagemodule.

Referring to FIG. 5, in order to simplify the circuit, in oneembodiment, the mains branch and the emergency branch share the secondrectifier and filter module. In other words, the output terminal of thesecond rectifier and filter module supplies power to the constantvoltage module and the constant current module at the same time.

In one embodiment, the power storage module has a signal input terminalfor detecting the mains signal. When power is off, the power storagemodule supplies power to the LED, and when power is on, the powerstorage module stops supplying power to the LED. In one embodiment, thesignal input terminal of the power storage module is coupled to thecharging circuit. Alternatively, the signal input terminal of the powerstorage module may be coupled to the mains branch.

The LED light includes a mechanical part and a circuit part. Themechanical part does not affect the implementations of the technicalsolutions according to the present disclosure. However, in the presentdisclosure, an improved mechanical part is also provided below.

Based on the abovementioned driving circuit and LED emergency light, anembodiment of the present disclosure also provides a power supply systemwith an LED emergency light. It is understandable that the presentdisclosures described by referring to the drawings about any one of thedriving circuit, the LED emergency light and the power supply system mayalso be regarded as the disclosure to the others of the driving circuit,the LED emergency light and the power supply system.

The power supply system with an LED emergency light in this embodimentincludes the LED emergency light according to the present disclosure andAC lines that are coupled to the power connecting terminals of the LEDemergency light.

Referring to FIG. 3, in one embodiment, a first switch, which is usedfor generating driving signals, is installed on an AC line that iscoupled to the first terminal. The first switch can be triggered on siteor be triggered in a remote manner. The first switch may be installed inan indoor wall, a light holder or a related electrical system.

The first switch, depending on its operating state, i.e., on or off,also determines the presence of the driving signals. For example, in thecase where it is required for the LED emergency light to work, the firstswitch, which is normally opened, can be triggered to send drivingsignals to the mains branch so as to turn on the mains branch. Since thesecond terminal always supplies power to the LED via the mains branch,once the mains branch is turned on, the LED can be lit.

Referring to FIG. 12, the first switch is coupled to one of the pins ofthe first terminal, and the one of the pins of the first terminal may befurther connected with a fuse F3 in series. A varistor RV2 may beconnected between the two pins of the first terminal. The firstrectifier and filter module includes a bridge rectifier BD2, a capacitorC26 and a resistor R36, wherein the capacitor C26 and the resistor R36function to filter. After rectification, power is supplied to theprimary side of the first optocoupler U4. The primary side of the firstoptocoupler is further connected with a resistor R35, a resistor R35′,and a capacitor C28. The secondary side of the first optocoupler U4 isconnected to the constant current module.

As the first terminal is only used for control, the capacitor of thefirst rectifier and filter module for filtering may be a conventionalcapacitor C26 instead of an electrolytic capacitor, which brings thebenefits of cost-effectiveness, long service life, and low hidden safetyrisk.

Referring to FIG. 4, in one embodiment, a first switch, which is usedfor generating driving signals, is installed on an AC line that iscoupled to the first terminal, and a second switch, which is used forcutting off the mains power to switch the driving circuit into a modelof supplying power from the power storage module to the LED, isinstalled on an AC line that is coupled to the second terminal.

The second switch, depending on its operating state, i.e., on or off,directly determines the power supply of the mains branch. In the casewhere a real-time power supply is required, the second switch may benormally closed. The emergency branch can be actively detected with thesecond switch. In particular, the second switch may be turned off (i.e.,cutting off the second terminal) to stop supplying power via the mainsbranch, so that the power storage module directly supplies power to theLED, thereby pre-detecting whether the emergency branch can operatenormally.

In one embodiment, the second switch is a normally-closed switch. Thesecond switch may be installed in an indoor wall, a light holder or arelated electrical system.

Referring to FIG. 11, the second switch is coupled to one of the pins ofthe second terminal, and each of the pins of the second terminal may befurther connected with a fuse f1 and a fuse f2 in series, respectively.A varistor RV1 may be further connected between the two pins of thesecond terminal. Power is then supplied to the first EMI filter circuit,which specifically includes an inductance RV1, an inductance LM2, acapacitor CX1, a capacitor CX2, a resistor R1, a resistor R2, and aresistor R2′, and then supplied to the bridge rectifier BD1 forrectification, and then supplied to the second EMI filter circuit, whichspecifically includes an inductance L1, a resistance R3, a capacitanceC1, and a capacitance C2. After filtering, power is supplied to theconstant current module and the constant voltage module.

In one embodiment, the constant current module includes a firsttransformer. The primary side of the first transformer is coupled to thesecond rectifier and filter module, and the on/off of the primary sideof the first transformer is controlled by the first controller. In oneembodiment, the first controller is powered by the second rectifier andfilter module. In one embodiment, the first controller is furtherregulated and powered by the secondary side of the first transformer. Inone embodiment, a first control element is coupled between the secondrectifier and filter module and the power supplying terminal of thefirst controller, which is controlled by the driving signal from thefirst terminal.

Referring to FIG. 15, the constant current module includes a firsttransformer T2. The primary side of the first transformer T2 isconnected in series with a MOS transistor Q2, and the gate of the MOStransistor Q2 is connected to and controlled by the first controller U2.For example, the first controller U2 may be configured as a MT7933 chip.

A pin 5 of the first controller U2 is configured as the power supplyingterminal, and the second rectifier and filter module supplies power tothe pin 5 through a resistor R34, a resistor R33, a resistor R33′, and atriode Q3 in sequence. Power is supplied to the pin 5 via a diode D7, aresistor 30 and a triode Q3 after being regulated by the secondary sideof the first transformer T2.

In the initial stage of power-on, the first controller U2 is directlypowered by the second rectifier and filter module. After the firsttransformer T2 becomes stable, power is regulated and supplied by thesecondary side so as to further ensure the stability of the operationand the power supply.

The triode Q3 may be regarded as the first control element, and theon/off of the triode Q3 is also related to the driving signal from thefirst terminal, i.e., the signal of the first optocoupler.

After power is on, due to an electrolytic capacitor CD3 which absorbsand storage power, the voltage at the left side (in the direction of thefigure) of the resistor R31 rises with a slight delay. After the MOStransistor Q4 is turned on, the base of the triode Q3 is grounded, sothat the triode Q3 cannot supply power to the first controller U2, whichmeans that the constant current module is turned off and out of work.

If the first switch is triggered, the first optocoupler will input a lowlevel to the gate of the MOS transistor Q4 to turn off the MOStransistor Q4, and thus the voltage of the base of the triode Q3 willrise so that the triode Q3 will be turned on to supply power to thefirst controller U2, which means that the constant current module willoperate normally to supply power to the LED.

In one embodiment, the constant voltage module includes a secondtransformer. The primary side of the second transformer is coupled tothe second rectifier and filter module, and the on/off of the primaryside of the second transformer is controlled by the second controller.In one embodiment, the second controller is powered by the secondrectifier and filter module. In one embodiment, the second controller isfurther regulated and powered by the secondary side of the secondtransformer.

Referring to FIG. 14, the constant voltage module includes a secondtransformer T1. The primary side of the second transformer is connectedin series with a MOS transistor Q1, and the gate of the MOS transistorQ1 is connected to and controlled by the second controller U1. Forexample, the second controller U1 may be configured as a M17990 chip.

A pin 3 of the second controller U1 is configured as a power supplyingterminal, and the second rectifier and filter module supplies power tothe pin 3 through a resistor R4, a resistor R5, and a resistor R5′ insequence. Power is supplied to the pin 3 via a diode D2 and a resistor12 after being regulated by the secondary side of the second transformerT1.

In the initial stage of power-on, the second controller U1 is directlypowered by the second rectifier and filter module. After the secondtransformer T1 becomes stable, power is regulated and supplied by thesecondary side so as to further ensure the stability of the operationand the power supply.

Referring to 6 a, in one embodiment, the driving circuit furtherincludes a control module coupled to the mains branch for obtaining orreleasing the control of turning off the mains branch. In oneembodiment, the control module is coupled to the constant current moduleof the mains branch for obtaining or releasing the control of turningoff the constant current module.

The control module controls the mains branch by means of the constantcurrent module, which controls the constant current module prior to thedriving signal or releases the control. When the control module obtainsthe control of turning off, the driving signal can be shielded; in otherwords, the first switch no longer works. When the control modulereleases the control of turning off, the first switch can operatenormally for opening and closing operations.

Referring to FIG. 6b , in one embodiment, the control module is coupledto the constant current module via the second optocoupler. In oneembodiment, the control of turning off occurs prior to the control tothe constant current module by the driving signal; in other words, thecontrol of turning off occurs prior to the on/off control to theconstant current module by the first switch.

Referring to FIG. 13, the control module is connected to the primaryside of the second optocoupler U3 via a resistor R37, and the secondaryside of the second optocoupler U3 is connected to the constant currentmodule. When the second optocoupler U3 is triggered by the controlmodule, a low-level signal is allowed to input into the constant currentmodule. Referring to the above-described, the low-level signal is inputinto the base of the triode Q3 so that the triode Q3 cannot supply powerto the first controller U2, which means that the control module obtainsthe control of turning off to the constant current module; in otherwords, the control module turns off the constant current module,regardless of whether the first optocoupler has a signal.

When the second optocoupler U3 does not input a low-level signal, thecontrol of turning off is released. In this case, as described above,the on/off of the triode Q3 is related to the on/off of the MOStransistor Q4 and the signal of the first optocoupler.

Referring to FIG. 24, the second optocoupler U3 is coupled to the powersupplying terminal of the first controller U2 via a MOS transistor Q8.The gate of the MOS transistor Q8 is coupled to the secondary side ofthe second optocoupler U3, the drain of the MOS transistor Q8 isgrounded, and the source of the MOS transistor Q8 is coupled to the baseof the triode Q3.

When the control module sends a low level to the primary side of thesecond optocoupler U3, the secondary side of the second optocoupler U3is turned off, and the voltage of the gate of the MOS transistor Q8changes; in other words, the second optocoupler U3 sends a high level tothe gate of the MOS transistor Q8 to turn on the MOS transistor Q8, thebase of the triode Q3 is therefore grounded, so that the triode Q3cannot supply power to the first controller U2, which means that thecontrol module obtains the control of turning off to the constantcurrent module; in other words, the control module turns off theconstant current module, regardless of whether the first optocoupler hasa signal.

This avoids a weak leakage current which may occur in the case where thecontrol module is asleep. The leakage current may be mistaken for ahigh-level output current and thus may trigger the second optocouplerU3, thereby turning off the constant current module. In the case where aMOS transistor is connected between the second optocoupler U3 and thebase of the triode Q3, a signal can be sent only if the control moduleoutputs a low level, so that even if the control module has a leakagecurrent, the output high level will not affect the constant currentmodule.

Referring to FIG. 6b , in one embodiment, the control module is furthercoupled with a third switch for instructing the control module to turnoff the mains branch and thus stop supplying power to the LED and toturn on the emergency branch to supply power to the LED.

The third switch can also serve as a test switch for detecting whetherthe emergency branch can respond normally. The control module turns offthe mains branch by turning off the constant current module through thesecond optocoupler. In practice, as the mains power is generallyconnected, the control module will also send a signal to the emergencybranch to power the LED.

In one embodiment, the emergency branch is provided with a controlelement such as a switch that controls the charging circuit to chargethe power storage module. The control element is also controlled by thecontrol module. When the control module turns off the emergency branchby means of the control element, the charging circuit cannot charge thepower storage module, and the power storage module supplies power to theLED.

In one embodiment, the third switch is configured as a normally openswitch so that it would not affect the normal operation of the LEDemergency light. In one embodiment, the third switch is installed on thelight tube, which is convenient for control and an on-site operation.

Referring to FIG. 18, the control module may be configured as amicrocontroller U6, and the third switch is connected to a pin 4 of themicrocontroller U6. After the third switch is triggered, themicrocontroller U6 sends a signal to the second optocoupler via the pin3 to turn off the constant current module.

In order to avoid that the emergency branch and the mains branch supplypower to the LED at the same time (i.e., a simultaneous-turning-onphenomenon), the constant current module and the emergency branch forsupplying power to the LED can be turned on or off in order, that is,the output time of the constant current module in operation is differentfrom that of the emergency branch in operation. The second rectifier andfilter module described in the foregoing embodiment which is shared bythe mains branch and the emergency branch ensures the consistency of thetime difference.

In one embodiment, in the case where it is required for the mains branchto supply power, the control module first turns off the emergency branchto supply power to the LED, and then releases the control of turning offto the constant current module; in the case where it is required for theemergency branch to supply power, the control module first turns off theconstant current module to supply power to the LED and obtains thecontrol of turning off to the constant current module, and then turns onthe emergency branch to supply power to the LED.

After the control of turning off to the constant current module isreleased, the first switch can be normally connected to control theconstant current module if there is no timing control, once the firstswitch is triggered, the emergency branch and the mains branch maysupply power to the LED at the same time. Therefore, the emergencybranch should be first turned off and thus stop supplying power to theLED. Similarly, when the emergency branch supplies power, the constantcurrent module should be first turned off.

Referring to FIG. 7, in one embodiment, the power storage moduleincludes:

a power storage element, which is coupled to the constant voltage modulefor supplying power through the constant voltage module;

a boosting module, which is coupled to the power storage element forboosting the output voltage of the power storage element to supply powerto the LED; and

a switching module for detecting the output voltage of the constantvoltage module to control the operation of the boosting module.

In one embodiment, a fourth switch is coupled between the constantvoltage module and the power storage module. The control module activelycontrols the on/off of the charging circuit of the emergency branch bycontrolling the on/off of the fourth switch. In one embodiment, thefourth switch is configured as a normally closed switch. The fourthswitch may be configured as a MOS transistor or other circuit devicesthat can be turned on or off. In one embodiment, the power storageelement may be configured as a capacitor, a battery pack, or othercircuit devices that can storage power. For example, in the case ofadopting the battery pack, the charging and discharging managementmodule and the temperature monitoring management module of the batterypack can be further configured using conventional technologies.

Referring to FIGS. 16 and 18, a pin 2 of the microcontroller U6 of thecontrol module is configured as a signal output terminal and can controlthe on/off of the triode Q5 via a resistor R49. The fourth switch isconfigured as a MOS transistor Q6, and the gate of the MOS transistor Q6is connected to the collector of the triode Q5. The microcontroller U6controls the on/off of the MOS transistor Q6 through the on/off oftriode Q5. Normally, the triode Q5 is turned on, and the gate of the MOStransistor Q6 is at a low level (that is, the MOS transistor Q6 is alsoturned on). When it is required to turn off the MOS transistor Q6, themicrocontroller U6 turns off the triode Q5. so that the level of thegate of the MOS transistor Q6 rises; that is, the MOS transistor Q6 isturned off.

The power storage element is configured as a battery pack BAT1. Once theMOS transistor Q6 is turned on, the battery pack BAT1 can be charged.When the battery pack BAT1 is discharged, power is input into theboosting module and then boosted to power the LED.

Referring to FIG. 8, in one embodiment, a protection module is furthercoupled between the output terminal of the fourth switch and the powerstorage element, and an indicating module that displays informationduring charging is also coupled to the output terminal of the fourthswitch.

In one embodiment, the displaying information may be at least one ofacoustic signal and optical signal. In one embodiment, the indicatingmodule includes a light emitting diode. The indicating module is notdirectly connected in parallel with the power storage element, which canavoid extra power consumption when the power storage element isdischarged. In one embodiment, the protection module at least includes ashunt resistor, a diode connected in series for preventing backflow, anda fuse connected in series. In one embodiment, the indicating module iscoupled to the anode of the diode, and the cathode of the diode iscoupled to the power storage element.

Referring to FIG. 9, in one embodiment, the protection module and theboosting module are coupled to the power storage element via a fifthswitch.

In one embodiment, the fifth switch is installed on the light tube andserves as a switch for turning on or off the charging of the powerstorage element.

The fifth switch can directly control the charging and discharging ofthe power storage element. For example, during transportation or storagebefore installation and use, the fifth switch may be turned off. Duringroutine use, the fifth switch is turned on. The battery pack BAT1 isconnected to the boosting module via the fifth switch for emergencypower supply.

Referring to FIG. 16, the fourth switch is configured as a MOStransistor Q6, and the output terminal of the fourth switch is connectedto an indicating module which is configured as a light emitting diodeLED1 through a resistor R47 of the protection module. The resistor R47is further connected with a capacitor C24 in parallel.

The output terminal of the fourth switch charges the battery pack BAT1via a resistor R44 which is connected with a resistance R45 and aresistor R46 in parallel, a diode D12, a fuse f4, and the fifth switchof the protection module.

The diode D12 which is provided between the indicating module and thepower storage element can prevent the power storage element fromsupplying power to the indicating module when discharging, therebyreducing power consumption, without affecting the displaying ofcharging.

in one embodiment, the switching module includes a second controlelement. The control terminal of the second control element is coupledto the output terminal of the fourth switch for detecting voltage, andthe output terminal of the second control element is coupled to theboosting module. In one embodiment, the input terminal of the boostingmodule is coupled to the power storage element, and the boosting moduleuses an inductor to boost. In one embodiment, the boosting moduleincludes a third controller, and the inductor is coupled to the thirdcontroller to provide boosted power. The output terminal of the secondcontrol element is coupled to the third controller to instruct the thirdcontroller to operate.

Referring to FIGS. 16 and 17, the second control element is configuredas a triode Q7. In the case where the mains power is connected, theoutput terminal of the fourth switch (i.e., the MOS transistor Q6) isconnected to the base of the triode Q7 via the diode D13. The triode Q7is therefore turned off, and a control signal cannot be sent to theboosting module. In the case where the mains power is disconnected, thetriode Q7 is turned on, and the control signal can be sent to theboosting module for boosting power.

A third controller U5, for example, is configured as a MT7282 chip. Thepower storage element is connected to a pin 5 of the third controller U5via an inductor L2, and the triode Q7 is connected to a pin 2 of thethird controller U5 via a resistor R40. When the triode Q7 is turned on,the third controller U5 receives the signal and outputs an oscillationsignal through the pin 5 to boost the inductor L2, and then suppliespower to the LED via a diode D11, a resistor R42 (which is connectedwith a resistor R43 in parallel) and a diode D10 in sequence.

The switching module of the present disclosure has a simple circuitwithout a capacitor, which shortens the switching time between emergencylighting and normal lighting.

Referring to FIG. 10 and FIG. 18, in one embodiment, the control moduleincludes a microcontroller, and the power supplying terminal of themicrocontroller is coupled to the output terminal of the constantvoltage module and the power storage element at the same time.

In one embodiment, the control module further includes a voltagestabilizing unit. The output terminal of the constant voltage module andthe power storage element are simultaneously coupled to the inputterminal of the voltage stabilizing unit, and the output terminal of thevoltage stabilizing unit is coupled to the power supplying terminal ofthe microcontroller.

The constant voltage module and the power storage element can supplypower to the control module at the same time. A pin 1 of themicrocontroller U6 is configured as a power supplying terminal, and theoutput terminal of the voltage stabilizing unit U7 is connected to thepin 1.

The output terminal of the constant voltage module is connected to theinput terminal of the voltage stabilizing unit U7 via a diode D15 and aresistor R54 in sequence, and the power storage element is connected tothe input terminal of the voltage stabilizing unit U7 via a diode D14and a resistor R54 in sequence, which form a dual-power-supply systemand ensure that the microcontroller can operate normally in variousconditions.

When the power storage element has power and the mains power isavailable, they supply power at the same time, and when the powerstorage element is out of power, the mains power is connected, whichensures that the microcontroller can operate normally after the powerstorage element is discharged in an emergency state and the mains poweris restored.

The output terminal of the voltage stabilizing unit U7 is furthergrounded via a capacitor C21, and the input terminal of the voltagestabilizing unit U7 is further grounded via a capacitor C20.

in order to collect a corresponding signal, in one embodiment, theoutput terminal of the constant voltage module is further coupled to afirst signal input terminal of the microcontroller for the controlmodule to detect the mains power signal,

A pin 6 of the microcontroller U6 is configured as the first signalinput terminal. The output terminal of the constant voltage module isconnected to the pin 6 via a resistor R56. The pin 6 detects the mainspower signal, and when power is disconnected, the microcontroller sendsa corresponding signal to the fourth switch. The pin 6 is furthergrounded via a resistor R55 and a capacitor C25, respectively.

In one embodiment, the microcontroller is coupled to the controlterminal of the fourth switch through a first signal output terminal. Apin 2 of the microcontroller U6 is configured as the first signal outputterminal. In one embodiment, the power storage element is furthercoupled to the second signal input terminal of the microcontroller forthe control module to detect the voltage of the power storage element. Apin 7 of the microcontroller U6 is configured as a second signal inputterminal, which can reflect the voltage of the power storage element,and can manage the charging and discharging when the voltage is too highor too low.

In one embodiment, two terminals of the fifth switch are coupled to thesecond signal input terminal and the third signal input terminal of themicrocontroller, respectively, for the control module to detect andcompare the voltages of two terminals of the fifth switch. One terminalof the fifth switch connected to the power storage element is connectedto the pin 7 of the microcontroller U6 via a resistor R57, and the pin 7is further grounded via a resistor R58 and a capacitor C23,respectively. The other terminal of the fifth switch is connected to thethird signal input terminal (i.e., pin 5) of the microcontroller U6 viaa resistor R52, and the pin 5 is further grounded via a resistor R53 anda capacitor C22, respectively. If the input signals of the second signalinput terminal and the third signal input terminal are the same, thefifth switch is turned on. If the voltages of the second signal inputterminal and the third signal input terminal are different, the fifthswitch is turned off. In one embodiment, the microcontroller is coupledto the second optocoupler through the second signal output terminal. Apin 3 of the microcontroller U6 is configured as the second signaloutput terminal.

The control module includes a microcontroller and peripheral circuitsconnected to the pins of the microcontroller. The peripheral circuitsare mainly used for processing signals and powers to meet therequirements of the microcontroller. Therefore, the power supplyingterminal, the signal input terminal and the signal output terminal ofthe control module are equivalent to the power supplying terminal, thesignal input terminal and the signal output terminal of themicrocontroller, respectively.

Referring to FIG. 19 to FIG. 22, an embodiment of the present disclosureprovides an LED straight light, which includes a light tube, an LEDlight bar 4 and a driving circuit that are installed in the light tube.The light tube includes a tube body 1, and end caps 2 and 3 that arefixed at the two ends of the tube body 1, respectively. Each end cap isfixed with two pins. For example, the end cap 2 is fixed with two pins21, and the end cap 3 is fixed with two pins 31, which form two powerconnecting terminals, respectively.

With reference to the foregoing embodiments, the driving circuitincludes a signal branch, a mains branch, and an emergency branch havinga power storage module. When power is disconnected, the power storagemodule supplies power to the LED, and when power is connected, theexternal power source supplies power to the LED via the mains branch.The signal branch is coupled to the pins at one end of the light tubeand functions to transmit the driving signal to control the on/off ofthe mains branch. The mains branch is coupled to the pins at the otherend of the light tube and functions to transmit power to the LED lightbar.

In one embodiment, the control module is further coupled with a thirdswitch 53 for instructing the control module to turn off the mainsbranch and thus stop supplying power to the LED light bar 4 and to turnon the emergency branch to supply power to the LED light bar 4. A firstcircuit board is provided within the light tube, and the third switch 53is fixed on the first circuit board. The light tube is provided with adodging opening, and a control button for the third switch 53 is exposedoutside at the dodging opening.

In one embodiment, the emergency branch includes a power storageelement. The power storage element is coupled to a fifth switch 51 thatcontrols charging and discharging. A second circuit board is providedwithin the light tube, and the fifth switch 51 is fixed on the secondcircuit board. The light tube is provided with a dodging opening, and acontrol button for the fifth switch 51 is exposed outside at the dodgingopening.

In one embodiment, the emergency branch is provided with an indicatorlight 52 coupled to the power storage element and displaying informationduring charging. A third circuit board is provided within the lighttube, and the indicator light 52 is fixed on the third circuit board.The light tube is provided with a dodging opening or a transparent area,and the indicator light 52 is exposed outside at the dodging opening orlocated at a position corresponding to the transparent area.

In one embodiment, all the dodging openings are communicated to eachother or spaced-apart from each other.

In one embodiment, all the circuit boards are integrated into one singlepiece such as the circuit board 5.

Referring to FIGS. 19-22, an embodiment of the present disclosurefurther provides an LED light, which includes a light tube, and an LEDlight bar 4 and a driving circuit that are installed in the light tube.The driving circuit may use conventional technology. However, thedriving circuit is preferably configured as any one of the drivingcircuits in the foregoing embodiments.

The light tube includes a tube body 1, and end caps 2 and 3 fixed at twoends of the tube body, respectively. Each end cap is respectively fixedwith two pins. For example, the end cap 2 is fixed with two pins 21, andthe end cap 3 is fixed with two pins 31.

In one embodiment, the tube body 1 includes a bottom case 11 and a lighttransmitting cover 12 which are radially engaged with each other. Theouter walls of the bottom case 11 on the opposite sides in the radialdirection are provided with respective first receiving grooves 111, andthe inner walls of the bottom case 11 on the opposite sides in theradial direction are provided with respective second receiving grooves112. The inner walls of the light transmitting cover 12 are providedwith tabs 132 that engage with the respective first receiving grooves111. The LED light bar 4 includes a substrate and an LED fixed on thesubstrate, wherein the substrate is clighted and fixed in the secondreceiving grooves 112. The light tube 1 is provided with switches and/oran indicator light coupled to the driving circuit. The inner walls ofthe light transmitting cover 12 are provided with positioning grooves131, and the circuit board 5 is fixed in the positioning grooves 131.The switches and/or the indicator light are fixed on the circuit board5. The light transmitting cover 12 is further provided with dodgingopenings, and the switches and/or the indicator light are exposedoutside at the dodging openings.

For example, the switches and/or the indicator light in the foregoingembodiments may specifically include a third switch 53, a fifth switch51, and an indicator light 52. Three dodging openings are spaced-apartfrom each other, and the third switch 53, the fifth switch 51, and theindicator 52 correspond to and are exposed outside at the three dodgingopenings, respectively.

In one embodiment, an installation chamber 113 is formed between thesubstrate and the bottom case 11. The driving circuit is integrated in acircuit board that is fixed in the installation chamber 113. In oneembodiment, the bottom case 11 and the light transmitting cover 12 aresemi-cylindrical. In one embodiment, the bottom shell 11 is a profiledmember, and the outside of the bottom case 11 may be provided with heatdissipation ribs 114. In one embodiment, two opposite edges of thebottom case 11 in the circumferential direction are bent inward to formrespective bent portions. The first receiving grooves 111 are openedoutside the respective bent portions, and the second receiving grooves112 are opened inside the respective bent portions. In one embodiment,the light transmitting cover 12 is configured as a multi-sectionalstructure that includes multiple sections which are connected one afteranother in the length direction, wherein one section that is located atan end serves as an installation section 13, and the positioning grooves131 are opened at the inner wall of the installation section. In oneembodiment, there are two positioning grooves 131 that are arrangedopposite to each other, and two opposite sides of the circuit board 5are inserted into the corresponding positioning grooves 131. In oneembodiment, the inner wall of the installation section 13 is providedwith pairs of protruding bars, and the gap between the same pair ofprotruding bars serves as one of the positioning grooves 131. In oneembodiment, the end cap 2 and the end cap 3 surround and are fixed withthe two ends of the tube body 1, respectively.

The working process of the LED emergency light according to the presentdisclosure will be specifically described with reference to theforegoing embodiments and the drawings. After the LED emergency light isinstalled, the fifth switch is closed.

In the initial state, the first switch coupled to the first terminal isturned off; in other words, the mains power (120V-277V) cannot besupplied to the first terminal. However, the second switch is a normallyclosed switch, so the mains power (120V-277V) is supplied to the secondterminal.

When the first optocoupler switch is turned off, the operation conditionof the constant current module (MT7933) is not met. In other words, theMOS transistor Q4 is turned on and thus the base of the triode Q3 isgrounded to turn off the triode Q3, so that the power supplyingterminal, i.e., the pin 5, of the first controller U2 is not powered,which results that the first controller U2 does not operate. Theexternal power source cannot supply power to the LED via the mainsbranch, and the LED cannot be normally lit.

Because the mains power is supplied to the second terminal, both theconstant voltage module (MT7990) and the microcontroller of the controlmodule operate. After the microcontroller operates, the MOS transistorQ6 which serves as the fourth switch is first turned on so that the baseof the triode Q7 is at a high level and thus the triode Q7 is turnedoff, and therefore the third controller U5 (MT7282) of the boostingmodule does not work. The inductor L2 cannot boost the power to powerthe LED. In other words, the emergency branch cannot supply power to theLED.

Since the MOS transistor Q6 is turned on, the battery pack BAT1 can becharged normally, and the indicator light configured as the lightemitting diode LED1 is lit.

When a user wants to turn on the light, he/she can close the firstswitch. At this time, the first terminal is powered on, the firstoptocoupler switch is turned on, and the corresponding operationcondition of the constant current module is met. In other words, thegate of the MOS transistor Q4 is at a low level and thus the MOStransistor Q4 is turned off, the triode Q3 is turned on to supply powerto the power supplying terminal (i.e., the pin 5) of the firstcontroller U2, and the mains branch is turned on to light the LED.

Similarly, the emergency branch cannot supply power to the LED, thebattery pack BAT1 can be charged normally, and the indicator lightconfigured as the light emitting diode LED1 is lit.

In the case where the second switch is turned off (in this case, theemergency branch can be detected), power cannot be supplied to thesecond terminal, the second rectifier and filter unit cannot outputpower, and the constant voltage module and the constant current moduledo not operate. It is understandable that the battery pack BAT1 is notcharged, and the light emitting diode LED1 is not lit, either.

Because the microcontroller U6 of the control module is powered by thebattery pack BAT1 and thus can operates normally. The microcontroller U6cannot detect the mains signal at the output terminal of the constantvoltage module, so the MOS transistor Q6 is turned off; the triode Q7configured as the second control element is turned on, and the thirdcontroller U5 of the boosting module operates; the inductor L2 booststhe power to power the LED. In other words, the emergency branchsupplies power to the LED.

In this case, since the second switch is turned off, the mains power isalso disconnected. Because the constant current module does not operate,it does not make sense to open or close the first optocoupler.Correspondingly, the first switch does not operate, either.

In the case where the third switch is turned on (in this case, theemergency branch can be detected), the microcontroller U6 obtains aninstruction and turns on the second optocoupler, and the triode Q3 isturned off, so that power cannot be supplied to the power supplyingterminal (i.e., the pin 5) of the first controller U2, which resultsthat the constant current module cannot operate. The mains branch cannotsupply power to the LED, and the LED cannot be normally lit.

At the same time, the microcontroller U6 also causes the MOS transistorQ6 to be turned off, the battery pack BAT1 is not charged, and the lightemitting diode LED1 is not lit, either. When the MOS transistor Q6 isturned off, the triode Q7 of the switching module is turned on, and thenthe third controller U5 of the boosting module operates. The inductor L2boosts the power to power the LED. In other words, the emergency branchsupplies power to the LED.

In this state, because the constant current module does not operate, itdoes not make sense to open or close the first optocoupler.Correspondingly, the first switch does not operate, either.

The second switch is arranged in the AC line outside the light tube, andthe third switch is directly arranged on the light tube, which realizesdual emergency detection functions. The third switch facilitates thedetection during installation, and the second switch facilitates thedetection after installation.

In the case where the mains power is disconnected, neither the firstterminal nor the second terminal is powered. Neither the constantvoltage module nor the constant current module can operate, and themains branch cannot supply power to the LED. The LED cannot be normallylit. At the same time, the MOS transistor Q6 is turned off, the batterypack BAT1 is not charged, and the light emitting diode LED1 is not lit,either. Triode Q7 is turned on, and then the third controller U5 of theboosting module operates. The inductor L2 boosts the power to power theLED. In other words, the emergency branch supplies power to the LED.

In order to prevent the battery pack from over-discharging, themicrocontroller U6 is configured to detect the power supplying time ofthe emergency branch. For example, when the time is greater than 90minutes (in practice, the time limitation is related to the capacity ofthe battery pack BAT1 and may be adjusted as required), the voltage ofthe battery pack BAT1 drops to the warning value, then the charging anddischarging management module of the microcontroller U6 or the batterypack BAT1 itself will stop supplying power, and the LED will go out.Alternatively, the microcontroller U6 can communicate with the chargingand discharging management module to stop supplying power.

Because the voltage of the battery pack BAT1 is low, the microcontrollerwill also stop operating and enter a sleep and power-saving mode.

When the mains power is restored, the first and second terminals arepowered, and all of the constant voltage module, the constant currentmodule (which depends on the condition of the first switch) and themicrocontroller can operate normally.

In one embodiment, the microcontroller periodically charges anddischarges the power storage element of the power storage module, whichfacilitates to maintain the performance of the power storage element.

In one embodiment, the microcontroller sleeps when no mains signal isreceived. Failure to receive the mains signal may be a result of a powerfailure or that the second switch is turned off, that is, the constantvoltage module does not output power. During transportation or storage,the fifth switch is generally turned off, and the power storage elementhas not yet entered the operation state. The microcontroller gets into alow-power state after entering the sleep mode. The microcontroller willbe woken up until the sleep condition is released, for example, untilthe second terminal is powered on.

In one embodiment, the microcontroller turns off the constant currentmodule and closes the fourth switch when the fifth switch is opened.

In one embodiment, the microcontroller periodically charges anddischarges the power storage element of the power storage module afterthe LED emergency light has operated for a predetermined time periodsuch as 30 days, and stops timing during sleep. The microcontrollerstarts timing after being powered on for the first time, and stopstiming during sleep, and continues to timing after being woken up. Inaddition, the timing time is accumulated.

An embodiment of the present disclosure further provides a controlmethod of an LED emergency light, wherein the LED emergency light is theLED emergency light according to the foregoing embodiment, and thecontrol method includes charging and discharging the power storageelement of the power storage module by the control module in a periodicmanner.

In one embodiment, when discharging, the mains branch is first turnedoff, and then the emergency branch is driven to supply power to the LED.

In one embodiment, the technique of turning off the mains branch is tosend a signal to the constant current module through the secondoptocoupler to turn off the constant current module. After the controlmodule turns on the second optocoupler, the base of the triode Q3 isgrounded and thus turned off, the first controller U2 stops operating,and the mains branch no longer supplies power to the LED.

In one embodiment, the technique of driving the emergency branch tosupply power to the LED is to turn off the fourth switch, and theswitching module causes the boosting module to supply power to the LED.

The discharging degree can be controlled according to a time periodand/or the voltage of the power storage element. For example, in oneembodiment, after power is discharged for a predetermined time period,the emergency branch will be turned off to stop supplying power to theLED. In one embodiment, when power is discharged until the voltage ofthe power storage element is lower than the threshold, the emergencybranch will be turned off to stop supplying power to the LED. In oneembodiment, the technique of turning off the emergency branch to stopsupplying power to the LED is to turn on the fourth switch. In oneembodiment, when charging, the emergency branch is first turned off tostop supplying power to the LED, and then the mains branch is turned on.In one embodiment, the technique of turning on the mains branch is toturn off the second optocoupler. After the control module turns off thesecond optocoupler, the right of turning off is released. Thereafter,depending on the operation condition of the first switch, the triode Q3is turned on or off. The mains branch can be controlled to or not tosupply power to the LED by means of the first switch.

The technique of discharging and charging in sequence can also avoidsimultaneous-turning-on.

FIG. 23 shows the control logic diagram of the control module of the LEDin the present disclosure.

In the figure, the microcontroller of the control module is taken as theaction body. Turning on or off the constant current module meansreleasing or obtaining the right of turning off the constant currentmodule by sending a signal to the constant current module through thesecond optocoupler. When the constant current module is turned on, thepin 3 of the microcontroller is set to a low level, and when theconstant current module is turned off, the pin 3 of the microcontrolleris set to a high level.

Turning on or off the fourth switch means charging or non-charging thebattery pack, and also means that the battery pack does not supply ordoes supply power to the LED through the emergency branch. When thefourth switch is turned on, the pin 2 of the microcontroller is set to ahigh level, and when the fourth switch is turned off, the pin 2 of themicrocontroller is set to a low level.

The detection of the mains signal is determined by whether the pin 6 ofthe microcontroller is at a high level, whether the third switch isturned on or off is determined by the pin 4, whether the fifth switch isturned on or off is determined by the voltage comparison of the pin 5and the pin 7, and whether the voltage of the battery pack is higherthan the threshold is determined by the voltage of pin 7. During thedischarging of the battery pack, that is, during supplying power to theLED through the emergency branch, the microcontroller is in a detectionstate for low power and detects the voltage of the battery pack in realtime to avoid an over-discharge and thus protect the battery.

With reference to the above related embodiments, one embodiment of thepresent disclosure provides a control method for the LED emergencylight, including: S100, detecting a mains signal after starting up;S200, detecting whether the fifth switch is closed if the mains signalis detected; S300, detecting whether the third switch is closed if thefifth switch is detected to be closed; S400, sending a turning-on signalto the fourth switch if the third switch is not closed (which means thatthe LED can operate normally); S500, sending a signal of releasing theright of turning off to the constant current module after a delay suchas by 50 ms. The LED emergency light can now be turned on or off bymeans of the first switch.

Sending a signal of releasing the right of turning off to the constantcurrent module means turning off the second optocoupler.

In one embodiment, in step S200 of detecting whether the fifth switch isclosed, if the fifth switch is closed, the constant current module isthen turned off, and after a delay, the fourth switch is opened. In oneembodiment, in step S300 of detecting whether the third switch isclosed, if the third switch is closed (which means that a test for theemergency branch is required), the constant current module is thenturned off, and after a delay, the fourth switch is opened. In oneembodiment, when the closing time of the third switch exceeds athreshold such as five seconds, the microcontroller enters a detectionstate for low power.

In this embodiment, a function of detecting an active discharging isprovided. When the microcontroller detects that the closing time of thethird switch exceeds a threshold such as five seconds, the power storageelement discharges. When discharging, the constant current module isfirst turned off, and the fourth is turned off after a delay. In otherwords, the power storage element is discharged by supplying power to theLED through the emergency branch, and the operation time is reset.

In one embodiment, the control method for the LED emergency lightfurther includes recording the normal operation time of the LEDemergency light, and discharging the power storage element of the powerstorage module when the operation time reaches a threshold such as 30days. When discharging, the constant current module is first turned off,and the fourth switch is then turned off after a delay; in other words,the power storage element is discharged by supplying power to the LEDthrough the emergency branch. During discharging, the voltage of thepower storage element is detected in real time. When the voltage of thepower storage element drops below an expected value, the fourth switchis turned on (that is, charging the battery pack and no longer supplyingpower to the LED by the emergency branch); after a delay, sending asignal of releasing the right of turning off to the constant currentmodule (that is, turning off the second optocoupler).

The LED emergency light according to the present disclosure can benormally turned on or off, with the function of conventional lightingtube, and can also be used as an emergency light in the case where themains power is disconnected. In other words, the LED emergency light canbe used in both commercial situation and emergency situation. When theLED emergency light is removed from the light holder, it can also beused as a mobile emergency light.

What is claimed is:
 1. An LED light, comprising an LED and a drivingcircuit, the LED light having two power connecting terminals that is afirst terminal and a second terminal, respectively, wherein the drivingcircuit comprises a mains branch and a signal branch, and wherein thesignal branch is coupled to the first terminal for transmitting externaldriving signals to control on/off of the mains branch, and the mainbranch is coupled to the second terminal for transmitting power to theLED for power supply.
 2. The LED light according to claim 1, wherein themains branch is provided with a first control element for controllingthe on/off of the mains branch, and the first control element iscontrolled by the external driving signals.
 3. The LED light accordingto claim 1, wherein the signal branch and the mains branch are isolatedby a first optocoupler.
 4. The LED light according to claim 3, whereinthe signal branch comprises a first rectifier and filter module and afirst optocoupler, and the mains branch comprises a second rectifier andfilter module and a constant current module that are coupled insequence, wherein a secondary side of the first optocoupler is coupledto the constant current module.
 5. The LED light according to claim 1,wherein the driving circuit further comprises an emergency branch with apower storage module; when power is on, an external power sourcesupplies power to the LED via the mains branch, and when power is off,the LED is powered by the power storage module.
 6. The LED lightaccording to claim 5, wherein the emergency branch has a chargingcircuit, and when power is on, the external power source charges thepower storage module via the charging circuit to store power, and thepower storage module stops charging the LED.
 7. The LED light accordingto claim 6, wherein the emergency branch comprises a second rectifierand filter module, a constant voltage module, and a power storage modulethat are coupled in sequence, and the mains branch comprises a secondrectifier and filter module and a constant current module, wherein themains branch and the emergency branch share the second rectifier andfilter module.
 8. The LED light according to claim 6, wherein thedriving circuit further comprises a control module which has a firstsignal input terminal for detecting a mains power signal and a secondsignal output terminal coupled to the mains branch for controlling theon/off of the mains branch, wherein when power is off, the controlmodule turns off the mains branch, and when power is on, the controlmodule releases the control of turning off the mains branch after theemergency branch stops supplying power to the LED.
 9. The LED lightaccording to claim 8, wherein the control module is isolated from themains branch by a second optocoupler, and the mains branch comprises asecond rectifier and filter module and a constant current module,wherein a secondary side of the second optocoupler is coupled to theconstant current module.
 10. The LED light according to claim 8, whereinthe mains branch is provided with a first control element controlled bythe control module for controlling the on/off of the mains branch. 11.The LED light according to claim 10, wherein the mains branch comprisesa second rectifier and filter module and a constant current modulecoupled in sequence.
 12. The LED light according to claim 11, whereinthe constant current module comprises a continuous current unit and aswitching element coupled between the second rectifier and filter moduleand the LED, and a first controller for controlling the switchingelement, wherein the first control element is coupled between the secondrectifier and filter module and a power supplying terminal of the firstcontroller.
 13. The LED light according to claim 12, wherein the firstcontrol element is configured as a triode, a collector of the triode iscoupled to the second rectifier and filter module, an emitter is coupledto the power supplying terminal of the first controller, and a basereceives the external driving signals or control signals of a controlmodule.
 14. The LED light according to claim 13, wherein the signalbranch comprises a first rectifier and filter module and a firstoptocoupler coupled in sequence, and a second signal output terminal ofthe control module is coupled to a second optocoupler; the base of thetriode is grounded through a MOS transistor Q4 and a MOS transistor Q8,respectively, wherein the first optocoupler is coupled to a gate of theMOS transistor Q4, and the second optocoupler is coupled to a gate ofthe MOS transistor Q8.
 15. The LED light according to claim
 8. whereinthe first signal input terminal of the control module is coupled to thecharging circuit.
 16. The LED light according to claim 15, wherein theemergency branch comprises a second rectifier and filter module, aconstant voltage module, and a power storage module that are coupled insequence, wherein when power is on, the external power source chargesthe power storage module via the second rectifier and filter module andthe constant voltage module to store power, and the first signal inputterminal of the control module is coupled to an output terminal of theconstant voltage module.
 17. The LED light according to claim 8, whereinthe control module has a first signal output terminal coupled to thecharging circuit for controlling on/off of the charging circuit, and thecharging circuit has a fourth switch for controlling the on/off of thecharging circuit, wherein the fourth switch is coupled to the firstsignal output terminal and is controlled by the control module.
 18. TheLED light according to claim 17, wherein when power is off, the controlmodule turns off the fourth switch and the mains branch, and when poweris on, the fourth switch is first turned on, and the mains branch isthen turned on.
 19. The LED light according to claim 17, wherein thecontrol module periodically turns off the mains branch and the chargingcircuit in sequence, and then the power storage module supplies power tothe LED.
 20. The LED light according to claim 17, wherein the drivingcircuit further comprises a third switch coupled to the control module,the third switch instructs the control module to turn off the mainsbranch and the charging circuit in sequence, and then the power storagemodule supplies power to the LED.
 21. The light according to claim 17,wherein the emergency branch comprises a second rectifier and filtermodule, a constant voltage module, and a power storage module that arecoupled in sequence, and the fourth switch is coupled to between theconstant voltage module and the power storage module.
 22. The LED lightaccording to claim 8, wherein the control module has a power supplyingterminal that is coupled to both the power storage module and thecharging circuit.
 23. The LED light according to claim 6, wherein thepower storage module has a signal input terminal coupled to the chargingcircuit for detecting a charging signal, and when the external powersource charges the power storage module, the power storage module stopssupplying power to the LED, otherwise, the power storage module suppliespower to the LED.
 24. The LED light according to claim 23, wherein thepower storage module comprises: a power storage element, which iscoupled to an output terminal of the charging circuit; a boostingmodule, which is coupled to the power storage element and used to boostthe output voltage of the power storage element to supply power to theLED; a switching module, which is used to detect the output voltage ofthe charging circuit to control an operation of the boosting module. 25.The LED light according to claim 24, wherein the power storage modulefurther comprises a protection module coupled between the outputterminal of the charging circuit and the power storage element forprotecting the power storage element.
 26. The LED light according toclaim 23, wherein the power storage module further comprises anindicating module coupled to the output terminal of the charging circuitfor displaying information during charging.
 27. The LED light accordingto claim 26, wherein the protection module comprises an anti-reversediode coupled between the power storage element and the indicatingmodule in series.
 28. The LED light according to claim 24, wherein theLED light comprises a fifth switch coupled between the power storageelement and the boosting module for controlling the discharging of thepower storage element.
 29. The LED light according to claim 23, whereinthe charging circuit comprises a second rectifier and filter module anda constant voltage module, and a fourth switch is coupled between theconstant voltage module and the power storage module, wherein the signalinput terminal of the power storage module is coupled to an outputterminal of the fourth switch.
 30. The LED light according to claim 1,wherein the LED light comprises a light tube in which an LED light barand a driving circuit are installed, and the light tube comprises a tubebody and end caps fixed at both ends of the tube body, wherein each ofthe end caps is respectively fixed with two pins, with the two pins atone end coupled with the mains branch, and two pins at the other endcoupled to the signal branch.
 31. The LED light according to claim 30,wherein the tube body comprises a bottom case and a light transmittingcover that are engaged with each other in a radial direction.
 32. TheLED light according to claim 31, wherein the light transmitting cover isprovided with a dodging opening.
 33. The LED light according to claim32, wherein the driving circuit further comprises an emergency branchhaving a charging circuit and a power storage module, wherein when poweris off, the power storage module supplies power to the LED, and whenpower is on, the external power source supplies power to the LED via themains branch and charges the power storage module via the chargingcircuit to store power, and the power storage module stops supplyingpower to the LED.
 34. The LED light according to claim 33, wherein the pstorage module has a fifth switch for controlling the charging anddischarging of the power storage module, the fifth switch is exposed atthe dodging opening.
 35. The LED light according to claim 33, whereinthe output terminal of the charging circuit is coupled to an indicatingmodule having an indicator light, and the indicator light is exposed tothe dodging opening.
 36. The LED light according to claim 33, whereinthe driving circuit further comprises a control module which has a firstsignal input terminal for detecting a mains power signal and a secondsignal output terminal coupled to the mains branch for controlling theon/off of the mains branch, wherein when power is off, the controlmodule turns off the mains branch, and when power is on, the controlmodule releases the control of turning off the mains branch after theemergency branch stops supplying power to the LED.
 37. The LED lightaccording to claim 36, wherein the driving circuit further comprises athird switch coupled to the control module, the third switch instructsthe control module to turn off the mains branch and the charging circuitin sequence, and then the power storage module supplies power to theLED, wherein the third switch is exposed at the dodging opening.
 38. TheLED light according to claim 37, wherein the fifth switch, the thirdswitch or the indicator light are fixed on a circuit board, and an innerwall of the light transmitting cover is provided with positioninggrooves, and the circuit board is fixed in the positioning grooves. 39.The LED light according to claim 32, wherein the light transmittingcover has a multi-sectional structure that includes multiple sectionswhich are connected one after another in a length direction, wherein onesection that is located at an end serves as an installation section, andthe dodging opening is provided at the installation section.
 40. The LEDlight according to claim 32, wherein an installation chamber is formedbetween the substrate and the bottom case, and the driving circuit isfixed in the installation chamber by means of a circuit board.